Its funny that your names are not registered to anyone like : The diy world, the do it yourself world, not one owns the trade mark, so the funny part of this is who ever registers the name control your business next, they will be able to contact youtube and have any videos removed cause you never registered your business names.
The only way you will know when someone buys them, you will get notification from youtube that they removed all your videos.
using the name does not bring ownership.
Bet you wished you bought your names now instead of buying subs... guess you might lose it all now out of stupidity.
Check the laws and have your Mother explain them to you.